Ask Me Help Desk - Quadratic equation($&profit)

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help me understand?

how come (240+3xsquare)/x -24

come become xsquare-24x+80?
I know 3 x square & 240 is divided by 3,but how do I get from -24 to -24x?

anyone can help me confirm it?is (a)
30/x + 2?
(b) I don't know how to get though

$\frac{240+3x^{2}}{x}-24$

Multiply by x:

$240+3x^{2}-24x$

Divide by 3:

$x^{2}-8x+80$

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